In the agency world, we hear it constantly: “We’d love to work with you, but for that monthly retainer, we could just hire someone full-time in-house.”
At first glance, the math looks obvious.

• Agency Retainer: $X
• Junior Marketing Manager Salary: $X – 10%

The CFO looks at the spreadsheet, smiles, and approves the hire. They think they just saved the company money with their “strategic investment” and bought a dedicated resource.

They didn’t. They just bought a problem with a salary attached.

The first mistake is confusing Salary with Cost.
According to the U.S. Small Business Administration (SBA) and recent 2025 SHRM data, the base salary is just the tip of the iceberg. When you factor in payroll taxes, benefits, insurance, and equipment, the “fully loaded” cost of that employee is typically 1.25x to 1.4x their base pay.

But that’s the hard math. The softer side is where the profit quietly disappears. 

Consider the “Vacancy Tax.”
Current LinkedIn Talent Solutions data shows the average time-to-fill for a marketing role is now 44 days. That is six weeks of zero output, zero momentum, and zero revenue generation from that seat.

Then add the “Training Tax.”
A new hire typically requires 3-6 months to become fully productive and culturally integrated. During that ramp-up period, you are paying full price for partial output.

So, that “cheaper” $85,000 hire? By the time they are seated, trained, and effective, they have cost you well over $130,000 in real capital and opportunity cost. And we haven’t even talked about what happens if they quit (which, statistically, 30% of new hires do within the first year).

The deeper problem isn’t just financial; it’s operational.

When you hire a mid-level internal marketer, you are buying capacity. You are buying 40 hours a week of one person’s skills.

• If they are great at social management, they are probably average at copy.
• If they are great at copy, they are probably weak at design.
• If they are great at design, they probably don’t understand strategy.

You filled a seat, but there’s still a hole in what your team can actually do, and the execution is low-quality.

When you partner with a multi-disciplinary agency like STUN, you aren’t buying capacity. You are buying velocity.

For that same monthly investment, you aren’t getting one person trying to learn three jobs. You are getting:

• A Senior Level Researcher and Analyst’s experience and prowess
• A High-level Strategist’s market and audience insight.
• A Creative Director’s creative vision and stewardship. 
• A Senior Level Copywriter’s specialized voice.
• A Designer’s visual transformation and execution. (It is actually a team with different specialities and eyes.)

You get the fractional expertise of a complete, high-performance engine, instantly. No onboarding. No benefits package. No “Vacancy Tax.”

There is a time and place for in-house teams. They are essential for culture and daily continuity.

But if you are building your 2026 growth plan on the back of a “Generalist Junior” because you think it’s cheaper than an agency partner, check your math.

You might be saving on the invoice, but you are paying double in results.